From the manual...
NOTE: Use slots DIMM1 and DIMM3 if you need to use two memory modules. For more information, see System-board components.
The following table lists the available memory configuration matrix:
Configuration
Slot
DIMM1 DIMM2 DIMM3 DIMM4
8 GB 16 GB 24 GB 32 GB 64 GB
4 GB 8 GB 4 GB 8 GB 16 GB
4 GB 8 GB 4 GB 8 GB 16 GB
8 GB 8 GB 16 GB
8 GB 8 GB 16 GB
NOTE: Use slots DIMM1 and DIMM3 if you need to use two memory modules. For more information, see System-board components.
The following table lists the available memory configuration matrix:
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Configuration
Slot
DIMM1 DIMM2 DIMM3 DIMM4
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8 GB 16 GB 24 GB 32 GB 64 GB
4 GB 8 GB 4 GB 8 GB 16 GB
4 GB 8 GB 4 GB 8 GB 16 GB
8 GB 8 GB 16 GB
8 GB 8 GB 16 GB